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BITSAT2015MathematicsProbabilityActual

A bag contains 3 red and 3 white balls. Two balls are drawn one by one. The probability that they are of different colours is.

Options

  1. A3 / 10
  2. B2 / 5
  3. C3 / 5
  4. DNone of these

Correct answer

C. 3 / 5

Step-by-step solution

Let A event that drawn ball is red B event that drawn ball is white Then AB and BA are two disjoint cases of the given event. array l P(A B+B A)=P(A B)+P(B A) =P(A) P ( B A )+P(B) P ( A B ) array = 3 6 3 5 + 3 6 3 5 = 3 5

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